JP2541466B2 - Flood sensor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water immersion sensor, and more particularly to the detection of water immersion in a CATV relay amplifier of both CATV transmission systems.

[0002]

2. Description of the Related Art A water immersion sensor is one in which a water immersion sensor is mounted at a specific position in a CATV relay amplifier housing to detect the water immersion inside the relay.

[0003]

In the conventional water immersion detection in a CATV relay amplifier, the water infiltration state cannot be detected unless a certain amount of water is stored in the housing, and therefore, the water infiltration is detected before causing a device failure. There was a drawback that it was impossible to prevent flooding.

Further, depending on the environment around the housing, dew condensation may occur in the housing, and an erroneous operation such as the dew condensation sensor erroneously detecting the dew condensation as water infiltration may occur.

An object of the present invention is to provide a water-immersion sensor which detects water-immersion before causing equipment failure and does not malfunction.

[Means for Solving the Problems] Water immersion sensor according to the present invention
Is an inner conductor, an outer conductor, and the inner conductor and the outer conductor
And is divided into multiple layers with different water absorption
The water absorbent insulator and the resistance between the inner and outer conductors.
And means for detecting a change in the resistance value.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a water infiltration detection sensor according to an embodiment of the present invention, FIG. 2 is a water intrusion detection circuit diagram, and FIG. 3 is an installation state diagram of a water infiltration detection zone in a repeater.

First, referring to FIG. 1, in a water immersion sensor 7 according to this embodiment, a plurality of layers (3 to 6) of insulating material are provided between an inner conductor 1 and a mesh-shaped outer conductor 2. Water can enter from the outside through the mesh portion of the outer conductor 2.

The plurality of layers of insulating materials 3 to 6 are made of a material having a water absorbing property. As shown in FIG. 2, the resistance value between the outer conductor 2 and the inner conductor 1 is changed, that is, the voltage between both conductors is changed. The change is used to detect water infiltration. In the example of FIG. 2, the inner conductor 1 is pulled up to a high potential by the pull-up resistor 11 and the outer conductor 2 is grounded.

Referring to FIG. 3, in the relay device having the casing composed of the lid portion 10 and the body portion 9,
It is assumed that the water slightly enters the inside of the housing from the fitting surface between the lid portion 10 and the body portion 9 for some reason.

The water that has entered the housing fitting portion comes into contact with the water immersion sensor 7 stretched around the housing fitting surface. The outer conductor 2 of the water immersion sensor 7 shown in FIG. 1 is made of a metal having the same electric potential as that of the housing, and is meshed or perforated so that water can easily enter the inside of the water immersion sensor 7. There is.

Water that has penetrated into the inside of the outer conductor 2 through the gap is absorbed by the insulators 3 to 6 having a water absorbing property. The insulator 3-6 What layer (Contact Itewa four layers in FIG. 1)
The outer layer (insulator 3) is also divided into layers by using members with different water absorption for each layer, or by using members with different water absorption such as paper at the boundary of each layer. The structure is such that the inner layer (insulator 4) does not absorb water until the water becomes saturated in sequence.

When the infiltrated water cannot be completely absorbed by the insulators 3 to 6, the water comes into contact with the inner conductor 1. By thus saturating the entire insulator with water, a certain amount of water can be absorbed. This constant amount of water can be freely adjusted by processing the insulator depending on the application. In other words, you can adjust how much water is sensed.

By the way, as shown in FIG.
A voltage is applied to the inner conductor 1 by a pull-up resistor 11. When there is no water immersion, the outer conductor 2 and the inner conductor 1 are insulated by the insulators 3 to 6, so that the resistance value is infinitely infinite in terms of direct current.

Therefore, when water enters from the fitting surface of the lid part 10 and the body part 9 and reaches the inner conductor 1 inside the water immersion sensor 7, the resistance value between the outer conductor 2 and the inner conductor 1 becomes water. It is significantly reduced by the action. Therefore, the outer conductor 2
The voltage between the outer conductor 2 and the inner conductor 1 drops due to the decrease in the resistance value between the inner conductor 1 and the inner conductor 1.

The decrease of the voltage is monitored inside the state monitor 8, and when the voltage becomes a certain voltage or less, the state monitor 8 detects the infiltration of water into the housing. After detection, the center is notified by the signal of the CATV upstream line, and it becomes possible to know the inundation.

[0017]

According to the present invention, it is possible to detect water infiltration before water is stored in the housing, and it is possible to prevent water infiltration before causing equipment failure. Further, since the water immersion sensor also absorbs a small amount of water, it is effective in preventing malfunction of the water immersion detection due to dew condensation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a water immersion sensor according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram for detecting water immersion.

FIG. 3 is an installation state diagram of a water immersion sensor on a relay device.

[Explanation of symbols]

 1 Inner Conductor 2 Outer Conductor 3-6 Insulator 7 Water Ingress Sensor 8 Condition Monitor 9 Body 10 Lid

Claims (2)

(57) [Claims] 1. An inner conductor, an outer conductor, and a plurality of layers provided between the inner conductor and the outer conductor and having different water absorption rates.
A water-immersion sensor, comprising: a water-absorbing insulator that is provided; and means for detecting a change in resistance between the inner conductor and the outer conductor. 2. The shape of the outer conductor covers the insulator.
The infiltration sensor according to claim 1, which has a mesh shape .